Toggle-breech mechanism for automatic firearms.



H. BORGHARDT. TOGGLB'BREEGH MECHANISM FOR AUTOMATIC FIREARMS. APPLICATION FILED 00121, 1912.

1 ,090,5 1 5. Patented Mar. 17, 1914.

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COLUMBIA PLANOORAPH cry-,WASHING ON. D. c.

HUGO BOROI-IAR-DT, OF CHARLOTTENBURG, GERMANY.

TOGGLE-BREEGI-I MECHANISIVL FOB AUTOMATIC FIREARMS.

Specification of Letters Patent.

Application filed October 21, 1912. Serial No. 726,961.

To all whom it may concern Be it known that I, HUGO BORCHARDT, a citizen of the United States of America, residing at 31 Kantstrasse, Charlot-tenburg, in the Empireof Germany, have invented a certain new and useful 1 Improvement in Toggle-Breech Mechanism for Automatic Firearms, of which the following is a specification.

The present invent-ion has for its object an improvement in the toggle breech in accordance with U. S. Patent No. 918,951 in which a movable bearing or stop is arranged at one hinge of the toggle by means of which stop the toggle is brought from its extended position under the influence of the bottom pressureof the cartridge, thereby opening the breech.

While in the breech in accordance with U. S. Patent- No. 918,951 a separate tappet arm of the breech block guided with clearance on one side serves as the movable toggle bearing acting on one of the arms of the toggle in accordance with the present invention the wall of the casing is utilized for this purpose.

An embodiment of the invention is diagrammatically illustrated by way of example in the accompanying drawing.

Figure 1 is a side elevation of the breech,

partly in section. Fig. 2 is a diagrammatic view showing the middle lines and the hinges.

of the toggle joint and in section the portion of the casing underlying the middle hinge of the joint.

The front arm a of the toggle is rotatably mounted on the breech block is and the rear arm 6 on the casing g. The breech block is inserted without play in the casing and the front arm a of the joint is free of the breech block. The bearing or stops for the front hinge I of the joint and the rear hinge III are therefore fixed. The portion of the middle hinge of the joint which overlaps the case bears snugly on its lateral walls (Fig.2). The gas pressure exerted in the directio of the axis of the bore on the bottom of the cartridge and through the latter on the breech block is produces a resilient upward deformation of the casing between the hinge points I and III. Owing to this deformation the middle hinge II resting on the wall of the casing receives a blow from below which causes the toggle to break. Owing to Copies of this patent may be obtained for as the movable toggle stop and the opening.

of the toggle is produced even with .the smallest angle of aperture merely by the up: ward deformation of the casing. The novel toggle breech permits of greater retardation of the opening movement and consequently more efficient action of the powder gases upon the projectile. Furthermore the opening movement is more uniform so that it is unnecessary to provide a separate breech head for preventing the cartridge case from being torn ofl.

IVhat I claim and desire to secure by Let ters Patent of the United'States is 1. Breech mechanism for automatic firearms with fixed barrel comprising a breech block, a breech casing, a spring influenced toggle joint connecting said breech block with said breech casing and adapted to hold said breech block in the closed position, said toggle joint being adapted to be broken by flexure of said breech casing due to the gas pressure.

2. Breech mechanism for automatic firearms with fixed barrel comprising a breech block, a breech casing, a spring influenced toggle joint connecting said breech block with said breech casing and adapted to hold said breech block in the closed position, said toggle joint bearing snugly against said breech casing in such a manner that it is forced upward by the flexure thereof due to the discharge of the firearm.

3. Breech mechanism for automatic firearms with fixed barrel comprising a breech block, a breech casing, a spring influenced toggle joint connecting said breech block with said breech casing and adapted to hold said breech block in the closed position, the middle hinge of said toggle joint bearing snugly against said breech casing in such a manner that it is forced upward by the flexure thereof due to the discharge of the firearm.

In testimony whereof I aifix my signature in presence of two witnesses.

HUGO BORGHARDT.

Witnesses:

ROBERT MIOI-IALSKI, HENRY HASPER.

five cents each, by addressing the Commissioner of Patents, Washington, D. G."

Patented Mar. 17, 1914. 

